Effect

In battle

A Pokémon with this Ability will be cured of poison if it is poisoned while in battle (such as if it gains the Ability outside of battle or by an effect like Skill Swap, or is poisoned by a Pokémon with an Ability like Mold Breaker). If the Pokémon is holding a Pecha Berry or a Lum Berry, it will be eaten before Immunity cures the Pokémon of poison.

Outside of battle

Pokémon with this Ability can't take damage from poison outside of battle.